The structure of repair sequences in classroom conversation has been the focus for second or foreign language teachers or researchers, that is: trouble source, trigger and repair.

一直以来，许多外语教学研究者致力于课堂教师—学生会话中的修正片段的结构分析，既失误源、诱发因子和修正。

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And it finds that almost all of the DNA is homegrown and chock-full of sequences responsible for cellular protection and repair.

结果发现，几乎所有的DNA都是自生的这些基因序列负责细胞保护和修复。

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